Good thing that you had the previous downpipe still.
I was annoyed that my car (a 50k miler well cared for and largely standard C30 T5) failed the last MOT on emissions, I took it to a garage just 100 metres from my house and made it clear that it was still cold and would need warming before the test an hour later... Sure enough they thought they knew better and it failed with silly high readings, leading to me going for a 5 mile drive and it then passing, very frustratring.
I just treated it as a normal drive but with a few gear changes going up towards the 5-6k rpm mark. Next time I'll do that just before I drop it off
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